1 #include <linux/module.h>
2
3 #include <linux/inet_diag.h>
4 #include <linux/sock_diag.h>
5
6 #include <net/inet_sock.h>
7 #include <net/raw.h>
8 #include <net/rawv6.h>
9
10 #ifdef pr_fmt
11 # undef pr_fmt
12 #endif
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16 static struct raw_hashinfo *
raw_get_hashinfo(const struct inet_diag_req_v2 * r)17 raw_get_hashinfo(const struct inet_diag_req_v2 *r)
18 {
19 if (r->sdiag_family == AF_INET) {
20 return &raw_v4_hashinfo;
21 #if IS_ENABLED(CONFIG_IPV6)
22 } else if (r->sdiag_family == AF_INET6) {
23 return &raw_v6_hashinfo;
24 #endif
25 } else {
26 return ERR_PTR(-EINVAL);
27 }
28 }
29
30 /*
31 * Due to requirement of not breaking user API we can't simply
32 * rename @pad field in inet_diag_req_v2 structure, instead
33 * use helper to figure it out.
34 */
35
raw_lookup(struct net * net,struct sock * from,const struct inet_diag_req_v2 * req)36 static struct sock *raw_lookup(struct net *net, struct sock *from,
37 const struct inet_diag_req_v2 *req)
38 {
39 struct inet_diag_req_raw *r = (void *)req;
40 struct sock *sk = NULL;
41
42 if (r->sdiag_family == AF_INET)
43 sk = __raw_v4_lookup(net, from, r->sdiag_raw_protocol,
44 r->id.idiag_dst[0],
45 r->id.idiag_src[0],
46 r->id.idiag_if, 0);
47 #if IS_ENABLED(CONFIG_IPV6)
48 else
49 sk = __raw_v6_lookup(net, from, r->sdiag_raw_protocol,
50 (const struct in6_addr *)r->id.idiag_src,
51 (const struct in6_addr *)r->id.idiag_dst,
52 r->id.idiag_if, 0);
53 #endif
54 return sk;
55 }
56
raw_sock_get(struct net * net,const struct inet_diag_req_v2 * r)57 static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r)
58 {
59 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
60 struct sock *sk = NULL, *s;
61 int slot;
62
63 if (IS_ERR(hashinfo))
64 return ERR_CAST(hashinfo);
65
66 read_lock(&hashinfo->lock);
67 for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) {
68 sk_for_each(s, &hashinfo->ht[slot]) {
69 sk = raw_lookup(net, s, r);
70 if (sk) {
71 /*
72 * Grab it and keep until we fill
73 * diag meaage to be reported, so
74 * caller should call sock_put then.
75 * We can do that because we're keeping
76 * hashinfo->lock here.
77 */
78 sock_hold(sk);
79 goto out_unlock;
80 }
81 }
82 }
83 out_unlock:
84 read_unlock(&hashinfo->lock);
85
86 return sk ? sk : ERR_PTR(-ENOENT);
87 }
88
raw_diag_dump_one(struct sk_buff * in_skb,const struct nlmsghdr * nlh,const struct inet_diag_req_v2 * r)89 static int raw_diag_dump_one(struct sk_buff *in_skb,
90 const struct nlmsghdr *nlh,
91 const struct inet_diag_req_v2 *r)
92 {
93 struct net *net = sock_net(in_skb->sk);
94 struct sk_buff *rep;
95 struct sock *sk;
96 int err;
97
98 sk = raw_sock_get(net, r);
99 if (IS_ERR(sk))
100 return PTR_ERR(sk);
101
102 rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
103 inet_diag_msg_attrs_size() +
104 nla_total_size(sizeof(struct inet_diag_meminfo)) + 64,
105 GFP_KERNEL);
106 if (!rep) {
107 sock_put(sk);
108 return -ENOMEM;
109 }
110
111 err = inet_sk_diag_fill(sk, NULL, rep, r,
112 sk_user_ns(NETLINK_CB(in_skb).sk),
113 NETLINK_CB(in_skb).portid,
114 nlh->nlmsg_seq, 0, nlh,
115 netlink_net_capable(in_skb, CAP_NET_ADMIN));
116 sock_put(sk);
117
118 if (err < 0) {
119 kfree_skb(rep);
120 return err;
121 }
122
123 err = netlink_unicast(net->diag_nlsk, rep,
124 NETLINK_CB(in_skb).portid,
125 MSG_DONTWAIT);
126 if (err > 0)
127 err = 0;
128 return err;
129 }
130
sk_diag_dump(struct sock * sk,struct sk_buff * skb,struct netlink_callback * cb,const struct inet_diag_req_v2 * r,struct nlattr * bc,bool net_admin)131 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
132 struct netlink_callback *cb,
133 const struct inet_diag_req_v2 *r,
134 struct nlattr *bc, bool net_admin)
135 {
136 if (!inet_diag_bc_sk(bc, sk))
137 return 0;
138
139 return inet_sk_diag_fill(sk, NULL, skb, r,
140 sk_user_ns(NETLINK_CB(cb->skb).sk),
141 NETLINK_CB(cb->skb).portid,
142 cb->nlh->nlmsg_seq, NLM_F_MULTI,
143 cb->nlh, net_admin);
144 }
145
raw_diag_dump(struct sk_buff * skb,struct netlink_callback * cb,const struct inet_diag_req_v2 * r,struct nlattr * bc)146 static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
147 const struct inet_diag_req_v2 *r, struct nlattr *bc)
148 {
149 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
150 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
151 struct net *net = sock_net(skb->sk);
152 int num, s_num, slot, s_slot;
153 struct sock *sk = NULL;
154
155 if (IS_ERR(hashinfo))
156 return;
157
158 s_slot = cb->args[0];
159 num = s_num = cb->args[1];
160
161 read_lock(&hashinfo->lock);
162 for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) {
163 num = 0;
164
165 sk_for_each(sk, &hashinfo->ht[slot]) {
166 struct inet_sock *inet = inet_sk(sk);
167
168 if (!net_eq(sock_net(sk), net))
169 continue;
170 if (num < s_num)
171 goto next;
172 if (sk->sk_family != r->sdiag_family)
173 goto next;
174 if (r->id.idiag_sport != inet->inet_sport &&
175 r->id.idiag_sport)
176 goto next;
177 if (r->id.idiag_dport != inet->inet_dport &&
178 r->id.idiag_dport)
179 goto next;
180 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0)
181 goto out_unlock;
182 next:
183 num++;
184 }
185 }
186
187 out_unlock:
188 read_unlock(&hashinfo->lock);
189
190 cb->args[0] = slot;
191 cb->args[1] = num;
192 }
193
raw_diag_get_info(struct sock * sk,struct inet_diag_msg * r,void * info)194 static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
195 void *info)
196 {
197 r->idiag_rqueue = sk_rmem_alloc_get(sk);
198 r->idiag_wqueue = sk_wmem_alloc_get(sk);
199 }
200
201 #ifdef CONFIG_INET_DIAG_DESTROY
raw_diag_destroy(struct sk_buff * in_skb,const struct inet_diag_req_v2 * r)202 static int raw_diag_destroy(struct sk_buff *in_skb,
203 const struct inet_diag_req_v2 *r)
204 {
205 struct net *net = sock_net(in_skb->sk);
206 struct sock *sk;
207 int err;
208
209 sk = raw_sock_get(net, r);
210 if (IS_ERR(sk))
211 return PTR_ERR(sk);
212 err = sock_diag_destroy(sk, ECONNABORTED);
213 sock_put(sk);
214 return err;
215 }
216 #endif
217
218 static const struct inet_diag_handler raw_diag_handler = {
219 .dump = raw_diag_dump,
220 .dump_one = raw_diag_dump_one,
221 .idiag_get_info = raw_diag_get_info,
222 .idiag_type = IPPROTO_RAW,
223 .idiag_info_size = 0,
224 #ifdef CONFIG_INET_DIAG_DESTROY
225 .destroy = raw_diag_destroy,
226 #endif
227 };
228
__check_inet_diag_req_raw(void)229 static void __always_unused __check_inet_diag_req_raw(void)
230 {
231 /*
232 * Make sure the two structures are identical,
233 * except the @pad field.
234 */
235 #define __offset_mismatch(m1, m2) \
236 (offsetof(struct inet_diag_req_v2, m1) != \
237 offsetof(struct inet_diag_req_raw, m2))
238
239 BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) !=
240 sizeof(struct inet_diag_req_raw));
241 BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family));
242 BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol));
243 BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext));
244 BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol));
245 BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states));
246 BUILD_BUG_ON(__offset_mismatch(id, id));
247 #undef __offset_mismatch
248 }
249
raw_diag_init(void)250 static int __init raw_diag_init(void)
251 {
252 return inet_diag_register(&raw_diag_handler);
253 }
254
raw_diag_exit(void)255 static void __exit raw_diag_exit(void)
256 {
257 inet_diag_unregister(&raw_diag_handler);
258 }
259
260 module_init(raw_diag_init);
261 module_exit(raw_diag_exit);
262 MODULE_LICENSE("GPL");
263 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */);
264 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */);
265